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/etc/sysctl.d/30-postgresql-shm.conf is in postgresql-common 129.

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# Shared memory settings for PostgreSQL

# Note that if another program uses shared memory as well, you will have to
# coordinate the size settings between the two.

# Maximum size of shared memory segment in bytes
#kernel.shmmax = 33554432

# Maximum total size of shared memory in pages (normally 4096 bytes)
#kernel.shmall = 2097152